Multi mode modulator and method with improved dynamic load...

Details Multi mode modulator and method with improved dynamic load... Multi mode modulator and method with improved dynamic load...

2011-01-18

2011-01-18

Mis, David (Department: 2817)

Modulators

Pulse or interrupted continuous wave modulator

Plural modulation

C332S109000, C332S112000, C363S025000, C363S026000

Reexamination Certificate

active

07872546

ABSTRACT:
A dual mode modulator is proposed for driving a power output stage having a serial connection of high-side power FET and low-side power FET. The dual mode modulator includes a PWM modulator operating under a PWM-frequency and a PFM modulator for controlling the power output stage. To improve the dynamic load regulation of the dual mode modulator, a dynamic frequency booster can be added to the dual mode modulator to boost up the PWM-frequency from its normal operating frequency during a PFM-to-PWM mode transition period. Secondly, a dynamic slew rate booster can be added to boost up an error amplifier slew rate of the PWM modulator from its normal operating slew rate during the mode transition period. Thirdly, a dynamic turn-off logic circuit can be added to turn off the low-side power FET during the mode transition period.

REFERENCES:
patent: 2010/0231190 (2010-09-01), Falvey et al.

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